//package spring配置文件分类.main.java.com.itheima.controller;
//
//import org.springframework.web.bind.annotation.GetMapping;
//import org.springframework.web.bind.annotation.PathVariable;
//import org.springframework.web.bind.annotation.RequestMapping;
//import org.springframework.web.bind.annotation.RestController;
//
//@RestController
//@RequestMapping("/books")
//public class BookController {
//
//    @GetMapping("/{id}")
//    public String getById(@PathVariable Integer id){
//        System.out.println("id ==> " + id);
//        return "hello , spring boot!";
//    }
//
//}
//
//
